Computers allow us to squeeze the most out of everything, whether it's Google looking up things, so I guess that tends to make us a little lazy about reading books and doing things the hard way to understand how those things work.

The final frontier may be human relationships, one person to another.

When the time comes to start building deep space transports and refueling rocket tankers, it will be the commercial industry that steps up, not another government-owned, government-managed enterprise.

I inherited depression from my mother's side of the family. Her father committed suicide. She committed suicide the year before I went to the moon.

Look at what Silicon Valley has done - the advance of computers.

I want to keep on the move, keep stimulated and challenged.

Astronauts working for the government will always need to be either pilots or mission specialists. Those who want to be pilots should have military experience - ideally, a test pilot background.